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Synthesis of New Liquid Crystalline Diglycidyl Ethers

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Author(s): Issam Ahmed Mohammed | Rashidah Mohamed Hamidi

Journal: Molecules
ISSN 1420-3049

Volume: 17;
Issue: 1;
Start page: 645;
Date: 2012;
Original page

Keywords: synthesis | diglycidyl ether | schiff base | liquid crystal

ABSTRACT
The phenolic Schiff bases I–VI were synthesized by condensation reactions between various diamines, namely o-dianisidine, o-tolidine and ethylenediamine with vanillin or p-hydroxybenzaldehyde and subsequent reactions between these phenolic Schiff bases and epichlorohydrin to produce new diglycidyl ethers Ia–VIa. The structures of these compounds were confirmed by CHN, FT-IR, 1H-NMR, and 13C-NMR spectroscopy. Their thermotropic liquid crystalline behavior was studied using differential scanning calorimetry (DSC) and polarizing optical microscopy (POM). All the diglycidyl ethers prepared exhibit nematic mesophases, except for Va and VIa, which did not show any transition mesophases, but simply flow to liquids.
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